Search Publications
Scalable end-to-end recurrent neural network for variable star classification
Catelan, M.; Nikzat, F.; Protopapas, P. +3 more
During the last decade, considerable effort has been made to perform automatic classification of variable stars using machine-learning techniques. Traditionally, light curves are represented as a vector of descriptors or features used as input for many algorithms. Some features are computationally expensive, cannot be updated quickly and hence for…
Web of the giant: Spectroscopic confirmation of a large-scale structure around the z = 6.31 quasar SDSS J1030+0524
Comastri, Andrea; Zamorani, Giovanni; Vito, Fabio +14 more
We report on the spectroscopic confirmation of a large-scale structure around the luminous z = 6.31 quasi-stellar object (QSO) SDSS J1030+0524, powered by a one billion solar mass black hole. The structure is populated by at least six members, namely, four Lyman-break galaxies (LBGs), and two Lyman alpha emitters (LAEs). The four LBGs were identif…
Shapes and alignments of dark matter haloes and their brightest cluster galaxies in 39 strong lensing clusters
Oguri, Masamune; Suto, Yasushi; Kitayama, Tetsu +6 more
We study shapes and alignments of 45 dark matter (DM) haloes and their brightest cluster galaxies (BCGs) using a sample of 39 massive clusters from Hubble Frontier Field (HFF), Cluster Lensing And Supernova survey with Hubble (CLASH), and Reionization Lensing Cluster Survey (RELICS). We measure shapes of the DM haloes by strong gravitational lensi…
Pressure Profiles and Mass Estimates Using High-resolution Sunyaev-Zel'dovich Effect Observations of Zwicky 3146 with MUSTANG-2
Battaglia, Nicholas; Mroczkowski, Tony; Devlin, Mark +12 more
The galaxy cluster Zwicky 3146 is a sloshing cool core cluster at z = 0.291 that in X-ray imaging does not appear to exhibit significant pressure substructure in the intracluster medium (ICM). The published M500 values range between 3.88-0.58+0.62 to (22.50 ± 7.58) × 1014 M⊙, where ICM-based e…
Fundamental stellar parameters of benchmark stars from CHARA interferometry. I. Metal-poor stars
White, T. R.; Casagrande, L.; Jofré, P. +4 more
Context. Benchmark stars are crucial as validating standards for current as well as future large stellar surveys of the Milky Way. However, the number of suitable metal-poor benchmark stars is currently limited, owing to the difficulty in determining reliable effective temperatures (Teff) in this regime.
Aims: We aim to construct a…
Consistently Simulating a Wide Range of Atmospheric Scenarios for K2-18b with a Flexible Radiative Transfer Module
Rauer, H.; Kappel, D.; Herbst, K. +6 more
The atmospheres of small, potentially rocky exoplanets are expected to cover a diverse range in composition and mass. Studying such objects therefore requires flexible and wide-ranging modeling capabilities. We present in this work the essential development steps that lead to our flexible radiative transfer module, REDFOX, and validate REDFOX for …
Stellar Characterization of M Dwarfs from the APOGEE Survey: A Calibrator Sample for M-dwarf Metallicities
Wanderley, Fábio; Cunha, Katia; Smith, Verne V. +18 more
We present spectroscopic determinations of the effective temperatures, surface gravities, and metallicities for 21 M dwarfs observed at high resolution (R ∼ 22,500) in the H band as part of the Sloan Digital Sky Survey (SDSS)-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. The atmospheric parameters and metallicities are…
[C II] 158 µm self-absorption and optical depth effects
Beuther, H.; Stutzki, J.; Güsten, R. +7 more
Context. The [C II] 158 µm far-infrared fine-structure line is one of the most important cooling lines of the star-forming interstellar medium (ISM). It is used as a tracer of star formation efficiency in external galaxies and to study feedback effects in parental clouds. High spectral resolution observations have shown complex structures in…
The Saga of M81: Global View of a Massive Stellar Halo in Formation
Bell, Eric F.; Monachesi, Antonela; Bailin, Jeremy +7 more
Recent work has shown that Milky Way-mass galaxies display an incredible range of stellar halo properties, yet the origin of this diversity is unclear. The nearby galaxy M81—currently interacting with M82 and NGC 3077—sheds unique light on this problem. We present a Subaru Hyper Suprime-Cam survey of the resolved stellar populations around M81, re…
Exploring AGN and star formation activity of massive galaxies at cosmic noon
Papovich, Casey; Finkelstein, Steven L.; Kirkpatrick, Allison +11 more
We investigate the relation between active galactic nucleus (AGN) and star formation (SF) activity at 0.5 < z < 3 by analysing 898 galaxies with X-ray luminous AGNs (LX > 1044 erg s-1) and a large comparison sample of ~320 000 galaxies without X-ray luminous AGNs. Our samples are selected from a large (11.…